#include <lzma.h>
#include <stdio.h>
#include <linux/compiler.h>
#include "util.h"
#include "debug.h"

#define BUFSIZE 8192

static const char *lzma_strerror(lzma_ret ret)
{
	switch ((int) ret) {
	case LZMA_MEM_ERROR:
		return "Memory allocation failed";
	case LZMA_OPTIONS_ERROR:
		return "Unsupported decompressor flags";
	case LZMA_FORMAT_ERROR:
		return "The input is not in the .xz format";
	case LZMA_DATA_ERROR:
		return "Compressed file is corrupt";
	case LZMA_BUF_ERROR:
		return "Compressed file is truncated or otherwise corrupt";
	default:
		return "Unknown error, possibly a bug";
	}
}

int lzma_decompress_to_file(const char *input, int output_fd)
{
	lzma_action action = LZMA_RUN;
	lzma_stream strm   = LZMA_STREAM_INIT;
	lzma_ret ret;
	int err = -1;

	u8 buf_in[BUFSIZE];
	u8 buf_out[BUFSIZE];
	FILE *infile;

	infile = fopen(input, "rb");
	if (!infile) {
		pr_err("lzma: fopen failed on %s: '%s'\n",
		       input, strerror(errno));
		return -1;
	}

	ret = lzma_stream_decoder(&strm, UINT64_MAX, LZMA_CONCATENATED);
	if (ret != LZMA_OK) {
		pr_err("lzma: lzma_stream_decoder failed %s (%d)\n",
			lzma_strerror(ret), ret);
		goto err_fclose;
	}

	strm.next_in   = NULL;
	strm.avail_in  = 0;
	strm.next_out  = buf_out;
	strm.avail_out = sizeof(buf_out);

	while (1) {
		if (strm.avail_in == 0 && !feof(infile)) {
			strm.next_in  = buf_in;
			strm.avail_in = fread(buf_in, 1, sizeof(buf_in), infile);

			if (ferror(infile)) {
				pr_err("lzma: read error: %s\n", strerror(errno));
				goto err_fclose;
			}

			if (feof(infile))
				action = LZMA_FINISH;
		}

		ret = lzma_code(&strm, action);

		if (strm.avail_out == 0 || ret == LZMA_STREAM_END) {
			ssize_t write_size = sizeof(buf_out) - strm.avail_out;

			if (writen(output_fd, buf_out, write_size) != write_size) {
				pr_err("lzma: write error: %s\n", strerror(errno));
				goto err_fclose;
			}

			strm.next_out  = buf_out;
			strm.avail_out = sizeof(buf_out);
		}

		if (ret != LZMA_OK) {
			if (ret == LZMA_STREAM_END)
				break;

			pr_err("lzma: failed %s\n", lzma_strerror(ret));
			goto err_fclose;
		}
	}

	err = 0;
err_fclose:
	fclose(infile);
	return err;
}
92ba547587bc3075cc688fb8f'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/include/trace/events/page_ref.h'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=fe896d1878949ea92ba547587bc3075cc688fb8f'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include?id=fe896d1878949ea92ba547587bc3075cc688fb8f'>include</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/trace?id=fe896d1878949ea92ba547587bc3075cc688fb8f'>trace</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/trace/events?id=fe896d1878949ea92ba547587bc3075cc688fb8f'>events</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/trace/events/page_ref.h?id=fe896d1878949ea92ba547587bc3075cc688fb8f'>page_ref.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='fe896d1878949ea92ba547587bc3075cc688fb8f'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Joonsoo Kim &lt;iamjoonsoo.kim@lge.com&gt;</td><td class='right'>2016-03-17 14:19:26 -0700</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2016-03-17 15:09:34 -0700</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/trace/events/page_ref.h?id=fe896d1878949ea92ba547587bc3075cc688fb8f'>fe896d1878949ea92ba547587bc3075cc688fb8f</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/trace/events/page_ref.h?id=fe896d1878949ea92ba547587bc3075cc688fb8f'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=fe896d1878949ea92ba547587bc3075cc688fb8f'>582ae505611bafae117c0de8498916485699ac78</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/trace/events/page_ref.h?id=fe896d1878949ea92ba547587bc3075cc688fb8f'>include/trace/events/page_ref.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/trace/events/page_ref.h?id=444eb2a449ef36fe115431ed7b71467c4563c7f1'>444eb2a449ef36fe115431ed7b71467c4563c7f1</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/trace/events/page_ref.h?id=fe896d1878949ea92ba547587bc3075cc688fb8f&amp;id2=444eb2a449ef36fe115431ed7b71467c4563c7f1'>diff</a>)</td></tr></table>
<div class='commit-subject'>mm: introduce page reference manipulation functions</div><div class='commit-msg'>The success of CMA allocation largely depends on the success of
migration and key factor of it is page reference count.  Until now, page
reference is manipulated by direct calling atomic functions so we cannot
follow up who and where manipulate it.  Then, it is hard to find actual
reason of CMA allocation failure.  CMA allocation should be guaranteed
to succeed so finding offending place is really important.

In this patch, call sites where page reference is manipulated are
converted to introduced wrapper function.  This is preparation step to
add tracepoint to each page reference manipulation function.  With this
facility, we can easily find reason of CMA allocation failure.  There is
no functional change in this patch.

In addition, this patch also converts reference read sites.  It will
help a second step that renames page._count to something else and
prevents later attempt to direct access to it (Suggested by Andrew).

Signed-off-by: Joonsoo Kim &lt;iamjoonsoo.kim@lge.com&gt;
Acked-by: Michal Nazarewicz &lt;mina86@mina86.com&gt;
Acked-by: Vlastimil Babka &lt;vbabka@suse.cz&gt;
Cc: Minchan Kim &lt;minchan@kernel.org&gt;
Cc: Mel Gorman &lt;mgorman@techsingularity.net&gt;
Cc: "Kirill A. Shutemov" &lt;kirill.shutemov@linux.intel.com&gt;
Cc: Sergey Senozhatsky &lt;sergey.senozhatsky.work@gmail.com&gt;
Cc: Steven Rostedt &lt;rostedt@goodmis.org&gt;
Signed-off-by: Andrew Morton &lt;akpm@linux-foundation.org&gt;
Signed-off-by: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=fe896d1878949ea92ba547587bc3075cc688fb8f'>Diffstat</a> (limited to 'include/trace/events/page_ref.h')</div><table summary='diffstat' class='diffstat'>